# Sudoku by Logify — Write in the numbers! > Intuitive classic Sudoku game with drawing input and learning hints. (iPhone/iPad app by Logify LLC.) - Source: https://appshunter.io/ios/app/sudoku-by-logify/id1329597775 (this page in markdown: same URL + `.md`) - Developer: [Logify LLC](https://appshunter.io/developer/1114326492) - Category: Games, Board, Puzzle - Price: Free with in-app purchases - Rating: 4.70/5 from 1,308 App Store ratings · 19 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 45 MB - Languages: American English - Released: 2018-02-02 - Data updated: 2026-09-01 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/sudoku-by-logify/id1329597775/reviews.md ## What is Sudoku by Logify? Play Classic Sudoku the most intuitive way: write in the numbers with your finger. Feels just like playing on paper, only better; number highlighting and other features will help you locate patterns without giving away the solution easily. The game offers unlimited Sudokus in four difficulty levels from easy to expert. Each puzzle can be solved with logical reasoning; no guessing required. If you are new to Sudoku or want to try the next level up, use hints to learn new strategies. The advanced hint system will explain the logic behind each pattern and how to find it on your own. You will see that most of these strategies are not that difficult, even though it may be hard to find them on the board. Summary of features: • Number entry by drawing, no number pad • Use your finger as eraser (left-right-left) • Double tap to add/clear notes • Number highlighting, including notes • Completed numbers gray out (optional) • Switch between levels anytime, last game saved for each level • Unlimited puzzles, all solvable, no guessing required • Advanced hint system designed to teach new strategies • Auto notes (for hard and expert level) • Auto complete button (optional) • Daily Challenges • Undo/Redo • Statistics, top 10 times (tap on timer) • Game Center leaderboard and achievements • Font, board design, and backdrop options Enjoy! ## Key features - Number entry by drawing - Advanced hint system - Unlimited puzzles - Four difficulty levels - Number highlighting - Daily Challenges - Customizable design options ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Remove Ads | $4.99 | one-time | ## What do users think of Sudoku by Logify? Overall sentiment: positive **Pros** - 👍 Easy to write numbers - 🚀 Refreshing interface - 💡 Ability to write notes **Cons** - 🐛 Inconsistent note feature - 🐛 Handwriting recognition issues - 💡 Desire for more customization options **Commonly reported bugs** - Allows errors even when set to not allow - Difficulty erasing wrong numbers - Incorrectly identifies numbers written by user **Most requested features** - Allow users to enter their own notes - Add coloring options for notes - Improve handwriting recognition ## Recent user reviews (10 of 19) All indexed reviews: https://appshunter.io/ios/app/sudoku-by-logify/id1329597775/reviews.md ### 5/5 — It Really Works *2022-03-23, version 1.42* So far my favorite sudoko app, I love that I can write in the numbers, it’s refreshing from all the other apps where u have to select the box then select a number. Erasing is easy with a double circle. My only issue is the notes. You give us only the numbers that CAN be notes, which is a border line cheat. For notes ALL numbers should pop up and we choose the note. other than that great app. Please consider the note fix in your next upgrade. Coming back for an update still my go to sudoku app, this app could be the number #1 app in the puzzle category but they don’t even care I believe. It’s absolutely fun being able to write the numbers. ### 4/5 — Erase *2021-07-29, version 1.42* Wish I could erase a number after playing one after mistake ### 3/5 — Invalid entry *2021-02-02, version 1.42* Would be nice if this feature truly did not allow any errors not just 'invalid entry' inputs...minus for me. ### 3/5 — Notes *2020-12-21, version 1.42* I actually like the game. Only thing I don’t like is the notes. I want to enter my own. I don’t like that it shows me all the unplayed numbers and then I have to get rid of the ones I don’t want to show. I don’t enter notes until I’m pretty sure it’s down to just two possibles. ### 5/5 — Love it! Can you add coloring? *2019-09-07, version 1.38* This is a really great app that lets you write the numbers instead of tapping or typing them, and the interface is slick. Since we can already write the numbers would it be possible to add coloring so that we can make our own notes in different colors for Medusa and other strategies? That would be awesome! ### 3/5 — last version fan *2019-06-03, version 1.37* the last version was better. at least you had something to earn in the number of hints you could bank. now there is no incentive. ### 5/5 — Suduko *2019-05-01, version 1.34* Interesting brain game. ### 5/5 — Allows errors *2019-04-11, version 1.34* Great app, however it will allow errors even though it’s set to not allow. Somewhat confusing. ### 5/5 — Sudoku *2018-12-01, version 1.28* Excellent and addictive! Love this game! ### 1/5 — Says you win no matter what???? *2018-07-01, version 1.23* If you fill the board with ones, it says you win. Also removed typing and ability to leave notes... this was much better before the updates. ## Frequently asked questions about Sudoku by Logify ### What is Sudoku by Logify? Sudoku by Logify is a mobile application that allows you to play classic Sudoku puzzles. It offers an intuitive drawing-based input method that mimics the feel of playing on paper, enhanced with helpful features like number highlighting. ### What are the key features of this Sudoku app? Key features include number entry by drawing directly on the screen, an advanced hint system designed to teach new strategies, unlimited puzzles across four difficulty levels, number highlighting, customizable design options, and daily challenges. ### Is Sudoku by Logify free to play? The app is free to download and play, offering unlimited puzzles. It does include in-app purchases, which may offer additional features or content, but the core gameplay is accessible without cost. ### What devices is Sudoku by Logify compatible with? While specific compatibility details are not provided, the app is designed for mobile devices, typically supporting both iOS and Android operating systems. Users can check their respective app stores for precise version requirements. ### Who is this Sudoku app best suited for? This app is ideal for Sudoku enthusiasts of all levels, from beginners looking to learn new strategies with the advanced hint system to experienced players seeking unlimited, logically solvable puzzles with a natural input method. ## Version history (last 5 releases) ### 1.42 — 2020-12-07 Performance improvements, plus adjustments for iPhone 12 Pro Max. ### 1.40 — 2019-11-22 Fixed toolbar button text alignment on iOS 13. ### 1.39 — 2019-09-16 Fixes for the upcoming iOS release. ### 1.38 — 2019-07-03 If you have the "Auto clear notes" option turned off in Settings, double-tapping on a cell will now present all candidates for you to manually remove the invalid ones. ### 1.37 — 2019-05-26 Fixed an app crash on older devices. ## Apps similar to Sudoku by Logify | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sudoku : Daily Fun Puzzle Game](https://appshunter.io/ios/app/sudoku-daily-fun-puzzle-game/id6450412432) | 4.9 (2,336) | Free | Games | | [Sudoku Joy: Number Master Game](https://appshunter.io/ios/app/sudoku-joy-number-master-game/id1460985516) | 4.9 (738) | Free | Games | | [Sudoku Master Edition](https://appshunter.io/ios/app/sudoku-master-edition/id1260190370) | 4.6 (7,892) | Free | Games | | [Sudoku Quest - Puzzle Games](https://appshunter.io/ios/app/sudoku-quest-puzzle-games/id671755288) | 4.7 (1,852) | Free | Games | | [Sudoku Classic -Offline Puzzle](https://appshunter.io/ios/app/sudoku-classic-offline-puzzle/id1444261450) | 4.6 (1,000) | Free | Games | | [Sudoku by Joseph](https://appshunter.io/ios/app/sudoku-by-joseph/id421136193) | 4.7 (2,396) | Free | Games | ## More apps by Logify LLC - [Logitile](https://appshunter.io/ios/app/logitile/id1114326493) - [Nulla](https://appshunter.io/ios/app/nulla/id1144199581) - [Solitaire by Logify](https://appshunter.io/ios/app/solitaire-by-logify/id1215652581) - [FreeCell by Logify](https://appshunter.io/ios/app/freecell-by-logify/id1231740576) - [Spider by Logify](https://appshunter.io/ios/app/spider-by-logify/id1308596795) All apps by Logify LLC: https://appshunter.io/developer/1114326492 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-01.*